IOTA/IOTA-ES occultation update for (692) Hippodamia / HIP 9117 event on 2012 Nov 22, 14:50 UT Visible from Japan, E Russia Summary ------- On 2012 Nov 22 UT, the 45 km diameter asteroid (692) Hippodamia will occult a 7.6 mag star in the constellation Cetus for observers along a path across Japan, E Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.7 mag to 14.3 mag (the magnitude of the asteroid) for at most 3.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 52 * date and approx. time of event: 2012 Nov 22, 14:46 - 2012 Nov 22, 14:54 UT * geocentric midpoint of event [JD]: 2456254.11860833 * magnitude of target star: 7.6 * magnitude drop [mag]: 6.7 * estimated maximum duration [s]: 3.2 * Moon: 71 % sunlit, 37° distance * Sun: 141° distance * rough path description: Japan, E Russia The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 1.22 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .018", 57° ) * approx speed of asteroid's shadow [km/s]: 14.3206 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 9117 by 692 Hippodamia on 2012 Nov 22 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Longitude Longitude Longitude Longitude 80 35 16 82 0 0 14 54 35 1 157 -25 83 41 25 77 27 15 91 11 15 ... .. .. 83 32 37 81 0 0 14 54 34 2 160 -26 86 17 14 80 46 57 92 56 52 ... .. .. Latitude Latitude Latitude Latitude 84 0 0 80 49 49 14 54 34 2 160 -26 81 53 20 79 50 59 .. .. .. .. .. .. 85 0 0 80 26 35 14 54 34 2 161 -26 81 30 54 79 27 7 .. .. .. 77 16 59 86 0 0 80 2 4 14 54 34 3 162 -27 81 7 6 79 2 2 .. .. .. 76 50 56 87 0 0 79 36 14 14 54 33 3 163 -27 80 41 52 78 35 44 .. .. .. 76 23 49 88 0 0 79 9 4 14 54 33 4 164 -28 80 15 11 78 8 11 .. .. .. 75 55 37 89 0 0 78 40 32 14 54 32 4 165 -28 79 47 1 77 39 23 .. .. .. 75 26 21 90 0 0 78 10 38 14 54 32 5 166 -29 79 17 20 77 9 19 82 36 45 74 55 59 91 0 0 77 39 22 14 54 31 5 167 -29 78 46 10 76 37 59 82 6 0 74 24 33 92 0 0 77 6 45 14 54 30 6 168 -30 78 13 29 76 5 25 81 33 7 73 52 4 93 0 0 76 32 48 14 54 29 7 169 -30 77 39 21 75 31 37 80 58 7 73 18 33 94 0 0 75 57 33 14 54 28 7 170 -31 77 3 46 74 56 38 80 21 5 72 44 1 95 0 0 75 21 3 14 54 27 8 171 -31 76 26 48 74 20 29 79 42 4 72 8 30 96 0 0 74 43 20 14 54 25 8 172 -32 75 48 31 73 43 13 79 1 13 71 32 3 97 0 0 74 4 28 14 54 24 9 173 -33 75 8 57 73 4 54 78 18 40 70 54 41 98 0 0 73 24 31 14 54 22 10 174 -33 74 28 13 72 25 34 77 34 33 70 16 28 99 0 0 72 43 33 14 54 20 11 175 -34 73 46 23 71 45 18 76 49 2 69 37 26 100 0 0 72 1 38 14 54 18 11 176 -35 73 3 32 71 4 9 76 2 17 68 57 39 101 0 0 71 18 52 14 54 15 12 177 -36 72 19 45 70 22 11 75 14 26 68 17 10 102 0 0 70 35 19 14 54 13 13 178 -36 71 35 9 69 39 30 74 25 40 67 36 1 103 0 0 69 51 4 14 54 10 13 179 -37 70 49 49 68 56 8 73 36 6 66 54 18 104 0 0 69 6 12 14 54 7 14 180 -38 70 3 50 68 12 11 72 45 53 66 12 2 105 0 0 68 20 48 14 54 4 15 181 -39 69 17 18 67 27 43 71 55 9 65 29 18 106 0 0 67 34 56 14 54 0 16 182 -40 68 30 18 66 42 47 71 4 0 64 46 9 107 0 0 66 48 41 14 53 57 16 183 -41 67 42 55 65 57 29 70 12 33 64 2 40 108 0 0 66 2 7 14 53 53 17 184 -41 66 55 14 65 11 53 69 20 54 63 18 52 109 0 0 65 15 19 14 53 49 18 185 -42 66 7 19 64 26 1 68 29 9 62 34 50 110 0 0 64 28 20 14 53 45 19 186 -43 65 19 14 63 39 59 67 37 21 61 50 37 111 0 0 63 41 15 14 53 40 19 187 -44 64 31 5 62 53 49 66 45 36 61 6 16 112 0 0 62 54 7 14 53 36 20 188 -45 63 42 54 62 7 36 65 53 57 60 21 50 113 0 0 62 7 0 14 53 31 21 189 -46 62 54 45 61 21 22 65 2 29 59 37 22 114 0 0 61 19 57 14 53 26 22 191 -47 62 6 42 60 35 11 64 11 15 58 52 56 115 0 0 60 33 1 14 53 21 22 192 -48 61 18 48 59 49 6 63 20 17 58 8 33 116 0 0 59 46 15 14 53 15 23 193 -49 60 31 6 59 3 9 62 29 39 57 24 17 117 0 0 58 59 41 14 53 10 24 194 -50 59 43 38 58 17 24 61 39 22 56 40 11 118 0 0 58 13 22 14 53 4 24 195 -50 58 56 26 57 31 52 60 49 30 55 56 15 119 0 0 57 27 21 14 52 58 25 196 -51 58 9 35 56 46 37 60 0 4 55 12 33 120 0 0 56 41 40 14 52 52 25 197 -52 57 23 5 56 1 40 59 11 7 54 29 8 121 0 0 55 56 21 14 52 46 26 198 -53 56 36 58 55 17 3 58 22 40 53 46 0 122 0 0 55 11 25 14 52 40 26 200 -54 55 51 17 54 32 48 57 34 45 53 3 12 123 0 0 54 26 55 14 52 34 27 201 -55 55 6 3 53 48 58 56 47 23 52 20 45 124 0 0 53 42 52 14 52 27 27 202 -56 54 21 18 53 5 34 56 0 35 51 38 42 125 0 0 52 59 18 14 52 21 28 203 -57 53 37 4 52 22 37 55 14 24 50 57 4 126 0 0 52 16 14 14 52 14 28 204 -57 52 53 21 51 40 9 54 28 49 50 15 52 127 0 0 51 33 42 14 52 7 29 206 -58 52 10 12 50 58 11 53 43 53 49 35 8 128 0 0 50 51 43 14 52 1 29 207 -59 51 27 36 50 16 45 52 59 35 48 54 54 129 0 0 50 10 18 14 51 54 29 208 -60 50 45 37 49 35 52 52 15 58 48 15 10 130 0 0 49 29 28 14 51 47 30 209 -61 50 4 14 48 55 33 51 33 1 47 35 57 131 0 0 48 49 14 14 51 40 30 211 -61 49 23 28 48 15 49 50 50 46 46 57 18 132 0 0 48 9 38 14 51 33 30 212 -62 48 43 21 47 36 41 50 9 14 46 19 12 133 0 0 47 30 39 14 51 26 30 213 -63 48 3 52 46 58 10 49 28 24 45 41 41 134 0 0 46 52 19 14 51 19 31 214 -63 47 25 4 46 20 16 48 48 17 45 4 45 135 0 0 46 14 39 14 51 12 31 216 -64 46 46 57 45 43 1 48 8 55 44 28 26 136 0 0 45 37 39 14 51 5 31 217 -65 46 9 30 45 6 26 47 30 17 43 52 45 137 0 0 45 1 19 14 50 57 31 218 -65 45 32 46 44 30 30 46 52 24 43 17 41 138 0 0 44 25 41 14 50 50 31 219 -66 44 56 44 43 55 15 46 15 17 42 43 16 139 0 0 43 50 46 14 50 43 31 221 -66 44 21 25 43 20 41 45 38 55 42 9 30 140 0 0 43 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19 249 -58 32 50 35 32 1 53 33 51 42 31 4 0 169 0 0 32 14 15 14 47 47 18 249 -57 32 38 40 31 50 8 33 39 33 30 52 26 170 0 0 32 3 14 14 47 43 18 250 -56 32 27 34 31 39 11 33 28 15 30 41 39 171 0 0 31 53 0 14 47 39 17 251 -56 32 17 16 31 29 1 33 17 46 30 31 39 172 0 0 31 43 35 14 47 35 16 251 -55 32 7 47 31 19 40 33 8 7 30 22 26 173 0 0 31 34 58 14 47 32 15 252 -54 31 59 7 31 11 6 32 59 18 30 14 0 174 0 0 31 27 10 14 47 28 15 252 -53 31 51 16 31 3 21 32 51 18 30 6 22 175 0 0 31 20 10 14 47 25 14 253 -52 31 44 13 30 56 24 32 44 9 29 59 31 176 0 0 31 13 59 14 47 22 13 254 -51 31 38 0 30 50 15 32 37 49 29 53 27 177 0 0 31 8 37 14 47 19 12 254 -51 31 32 36 30 44 55 32 32 20 29 48 11 178 0 0 31 4 4 14 47 17 11 255 -50 31 28 1 30 40 23 32 27 41 29 43 42 179 0 0 31 0 19 14 47 14 11 255 -49 31 24 15 30 36 40 32 23 52 29 40 2 180 0 0 30 57 24 14 47 12 10 256 -48 31 21 19 30 33 45 32 20 54 29 37 9 -179 0 0 30 55 17 14 47 10 9 257 -47 31 19 12 30 31 39 32 18 46 29 35 4 -178 0 0 30 54 1 14 47 8 8 257 -46 31 17 55 30 30 22 32 17 29 29 33 47 -177 0 0 30 53 33 14 47 6 7 258 -46 31 17 28 30 29 54 32 17 3 29 33 18 -176 0 0 30 53 55 14 47 5 7 258 -45 31 17 50 30 30 15 32 17 27 29 33 38 -175 0 0 30 55 6 14 47 3 6 259 -44 31 19 3 30 31 26 32 18 42 .. .. .. -174 0 0 30 57 7 14 47 2 5 259 -43 31 21 5 30 33 26 32 20 49 .. .. .. -173 0 0 30 59 58 14 47 1 4 260 -42 31 23 58 30 36 15 32 23 46 .. .. .. -172 0 0 31 3 39 14 47 0 3 260 -41 31 27 42 30 39 54 32 27 35 .. .. .. -171 0 0 31 8 10 14 47 0 2 261 -40 31 32 15 30 44 22 32 32 16 .. .. .. -170 0 0 31 13 31 14 46 59 1 261 -40 31 37 39 30 49 40 32 37 48 .. .. .. -169 0 0 31 19 43 14 46 59 1 262 -39 31 43 55 30 55 49 32 44 12 .. .. .. Uncertainty in time = +/- 4 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: HIP 9117 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 57 31.2938 DE: -06 49 39.937 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .016, .013 ) * V mag [mag]: 7.6 * B mag [mag]: 7.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (692) Hippodamia approx. diameter [km]: 45 approx. diameter ["]: .026 distance from Earth [AU]: 2.41700 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 829 number of rejected observations: 34 time covered by the observations: 1901 Nov 05 - 2012 Oct 03 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.014, 49° remarks: * orbital elements for (692) Hippodamia : Mean anomaly = 293.49530635 deg Arg. of pericenter = 54.86558199 deg Long. of node = 63.53964927 deg Inclination = 26.11127015 deg Eccentricity = 0.17067876 Semimajor axis = 3.38223323 AU Perihelion dist = 2.80495785 AU Mag: H = 8.93, G = 0.15 Epoch of elements : MJD 56253.61900000 TDT (2012 Nov 22.619) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 22 692 Hippodamia 14h 50.8m UT 7.6 1 57 31.294- 6 49 39.94HIP 9117 7.8 14.3 45 3.2 2.417 -1.749 13.61 104.6868 -6.831 -46.12 -20.30 14.8466 0.39647 0.75941 -7.16624 3.73887 0.00275 0.00265 2000 292.92186720121119.00000 54.865582 63.539649 26.1112700.17067876 3.3822332 2.8049579 9.2 5.00.15 RATE 1.5845240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.018 57 2.22 0.031 0 0-2 3 056247.0020121122___9117 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 20:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org